How to view Disks, Partitions and Mount Points in Linux

🐧When installing packages in different Linux distros, please use the appropriate command. Here is a quick reference guide:
$ sudo apt-get install {PAKAGE_NAME_HERE} - [On Debian/Ubuntu & Mint]
$ sudo dnf install {PAKAGE_NAME_HERE} - [On CentOS/RHEL/Fedora and Rocky Linux/AlmaLinux]
$ pacman -S {PAKAGE_NAME_HERE} - [On Arch Linux]
$ emerge sys-apps/{PAKAGE_NAME_HERE} - [On Gentoo]
$ sudo dnf install {PAKAGE_NAME_HERE} - [On Fedora]
$ sudo zypper install {PAKAGE_NAME_HERE} - [On openSUSE]

I need help, while installing Ubuntu it appears to be the following message. "The installer needs to commit changes to partition tables, but cannot do so because partitions on the following mount point cloud not be unmounted /cdrom Please close any applications using these mount point Would you like the installer to try to unmount these partitions again" Thank you very much.

Plzz helip mee

Bro i need a help

Sir
How to access the hard disk (HDD)
It does not appear to me with the rest of the other parts

yo ! i installed fedora 37 kde in my new ssd and couldn't formate my old hdd fedora 37gnome now when i boot into ssd i get 5 partations
i have 240gb ssd & 1 tb hdd i just want ssd for apps and os & hdd for data can you help hear how can i just get 2 partations showing of ssd and hdd
1= 512 Mib internal drive sdb1
2=1.0 Gib internal drive sdb2
3=953 Mib internal drive sdbz
4=fedora_username
5=fedora_localhost-live